CSU BRAVO Instrumentation

CSU graduate student Taehyoung Lee changes the annular denuders and filter pick in the URG Annular Denuder Sampler. 24-hr samples of PM-2.5 (Teflo filter) and gaseous nitric acid (denuder 1) and gaseous ammonia (denuder 2) are collected using this instrument. Backup filters are used to quantify nitric acid and ammonia volatilized from collected particles.	A modified version of the organic aerosol sampler built by DRI for use in the Northern Front Range Air Quality Study (NFRAQS). This sampler is used to collect 24-hr aerosol samples for analysis of EC/OC and trace organic species.
The dual-channel Dionex DX-500 ion chromatography system set up for ion analysis at the K-Bar Ranch study site in Big Bend National Park. Samples are analyzed for major anions and cations on a weekly basis.
The Hewlett Packard Model 5973 GC-MS used for analysis of filters collected using the organic aerosol sampler.
The Micro-Orifice Uniform Deposit Impactor (MOUDI) used to collect size-resolved aerosol samples for chemical analysis of inorganic ions. 24-hr samples are taken six days a week.	CSU graduate student Taehyoung Lee changes impaction surfaces in the MOUDI aerosol sampler. Aluminum foil substrates are coated with silicone grease and baked to minimize particle bounce.
Aerosol inlets on the CSU aerosol trailer. The inlets on the left side of the photograph supply aerosol to CSU's continuous aerosol characterization instrumentation.

 

The aerosol instrumentation at BRAVO. The ambient aerosol inlet runs through the wood insert in the trailer window. Left to right: aerodynamic particle sizer (APS); differential mobility analyzer (DMA) and condensation particle counter (CPC); optical particle counter (OPC); and aethalometer.

The DMA / OPC combination to measure size distributions of submicron particles.

The APS / OPC combination to measure size distributions of supermicron particles.